World No. 31 Ian Poulter tossed up a bogey-free, 4-under-par 34-33=67 in the third round of the RBC Heritage to reach 13-under 200, up one spot on the day and good for the 54-hole lead by one over Luke List and Si Woo Kim, who he'll be grouped with in the final threesome on Sunday.
Seven of the Englishman's last 11 rounds have been in the 60s after having just three such showings in his first 20 rounds this season.
Dustin Johnson also struggled Saturday, firing a 1-over 72 to finish his third round tied for 41st at 3 under. Johnson had a run of four straight birdies in the middle of his round, but ended up with a 69. He closed the round with consecutive birdies on his final two holes, the eighth and the ninth. Sabbatini even got a bonus on his final tee box when he finally got his back to pop after stretching on No. 9 to make himself feel better.
"This might be the first time I played so well with a triple bogey", Kim said.
DeChambeau struck his second shot past the green and out of bounds by some condos.
Three holes later, DeChambeau botched another par 5, the fifth, by rolling his blast from a bunker off the green and into a sprinkler cover.
"Unbelievable what's happened on the par fives today", DeChambeau said as he saw his ball.
"We'll see if we have a last bit of plaid to put in the closet", said a grinning Poulter, referring to the tartan jacket given to the victor at Harbour Town Golf Links. This time, he to channel the game that's made him the world's top-ranked golfer for more than a year.
Billy Horschel and Pan Cheng-tsung are a further stroke back, while Kevin Kisner shot the joint-low round of the day - a five-under 66 - to move into a tie for sixth.
Again, Johnson pointed to putter problems this week.
He did well to save par from 15 feet at the fourth and got back on the birdie trail at the par-five next before he nailed another confident putt for birdie at the seventh to get to nine-under par. "Around here, you've got to hole some putts if you want to compete", he said.